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rt-thread
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86db9ed9
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rt-thread
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体验新版 GitCode,发现更多精彩内容 >>
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86db9ed9
编写于
6月 29, 2013
作者:
Y
yiyue.fang
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
reformat the coding style
convert Tabs to spaces
上级
3359419d
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
119 addition
and
112 deletion
+119
-112
src/memheap.c
src/memheap.c
+119
-112
未找到文件。
src/memheap.c
浏览文件 @
86db9ed9
...
...
@@ -286,36 +286,37 @@ void *rt_memheap_alloc(struct rt_memheap *heap, rt_uint32_t size)
}
RTM_EXPORT
(
rt_memheap_alloc
);
void
*
rt_memheap_realloc
(
struct
rt_memheap
*
heap
,
void
*
ptr
,
rt_size_t
newsize
)
void
*
rt_memheap_realloc
(
struct
rt_memheap
*
heap
,
void
*
ptr
,
rt_size_t
newsize
)
{
rt_err_t
result
;
rt_size_t
oldsize
;
struct
rt_memheap_item
*
header_ptr
;
struct
rt_memheap_item
*
new_ptr
;
if
(
newsize
==
0
)
{
rt_memheap_free
(
ptr
);
return
RT_NULL
;
}
/* align allocated size */
newsize
=
RT_ALIGN
(
newsize
,
RT_ALIGN_SIZE
);
if
(
newsize
<
RT_MEMHEAP_MINIALLOC
)
newsize
=
RT_MEMHEAP_MINIALLOC
;
if
(
ptr
==
RT_NULL
)
{
return
rt_memheap_alloc
(
heap
,
newsize
);
}
/* get memory block header and get the size of memory block */
header_ptr
=
(
struct
rt_memheap_item
*
)((
rt_uint8_t
*
)
ptr
-
RT_MEMHEAP_SIZE
);
oldsize
=
MEMITEM_SIZE
(
header_ptr
);
rt_size_t
oldsize
;
struct
rt_memheap_item
*
header_ptr
;
struct
rt_memheap_item
*
new_ptr
;
if
(
newsize
==
0
)
{
rt_memheap_free
(
ptr
);
return
RT_NULL
;
}
/* align allocated size */
newsize
=
RT_ALIGN
(
newsize
,
RT_ALIGN_SIZE
);
if
(
newsize
<
RT_MEMHEAP_MINIALLOC
)
newsize
=
RT_MEMHEAP_MINIALLOC
;
if
(
ptr
==
RT_NULL
)
{
return
rt_memheap_alloc
(
heap
,
newsize
);
}
/* get memory block header and get the size of memory block */
header_ptr
=
(
struct
rt_memheap_item
*
)
((
rt_uint8_t
*
)
ptr
-
RT_MEMHEAP_SIZE
);
oldsize
=
MEMITEM_SIZE
(
header_ptr
);
/* re-allocate memory */
if
(
newsize
>
oldsize
)
{
void
*
new_ptr
;
void
*
new_ptr
;
/* re-allocate a memory block */
new_ptr
=
(
void
*
)
rt_memheap_alloc
(
heap
,
newsize
);
if
(
new_ptr
!=
RT_NULL
)
...
...
@@ -327,74 +328,75 @@ void *rt_memheap_realloc(struct rt_memheap* heap, void* ptr, rt_size_t newsize)
return
new_ptr
;
}
/* lock memheap */
result
=
rt_sem_take
(
&
(
heap
->
lock
),
RT_WAITING_FOREVER
);
if
(
result
!=
RT_EOK
)
{
rt_set_errno
(
result
);
return
RT_NULL
;
}
/* split the block. */
new_ptr
=
(
struct
rt_memheap_item
*
)
(((
rt_uint8_t
*
)
header_ptr
)
+
newsize
+
RT_MEMHEAP_SIZE
);
RT_DEBUG_LOG
(
RT_DEBUG_MEMHEAP
,
(
"split: block[0x%08x] nextm[0x%08x] prevm[0x%08x] to new[0x%08x]"
,
header_ptr
,
header_ptr
->
next
,
header_ptr
->
prev
,
new_ptr
));
/* mark the new block as a memory block and freed. */
new_ptr
->
magic
=
RT_MEMHEAP_MAGIC
;
/* put the pool pointer into the new block. */
new_ptr
->
pool_ptr
=
heap
;
/* break down the block list */
new_ptr
->
prev
=
header_ptr
;
new_ptr
->
next
=
header_ptr
->
next
;
header_ptr
->
next
->
prev
=
new_ptr
;
header_ptr
->
next
=
new_ptr
;
/* determine if the block can be merged with the next neighbor. */
if
(
!
RT_MEMHEAP_IS_USED
(
new_ptr
->
next
))
{
struct
rt_memheap_item
*
free_ptr
;
/* merge block with next neighbor. */
free_ptr
=
new_ptr
->
next
;
heap
->
available_size
=
heap
->
available_size
-
MEMITEM_SIZE
(
free_ptr
);
RT_DEBUG_LOG
(
RT_DEBUG_MEMHEAP
,
(
"merge: right node 0x%08x, next_free 0x%08x, prev_free 0x%08x"
,
header_ptr
,
header_ptr
->
next_free
,
header_ptr
->
prev_free
));
free_ptr
->
next
->
prev
=
new_ptr
;
new_ptr
->
next
=
free_ptr
->
next
;
/* remove free ptr from free list */
free_ptr
->
next_free
->
prev_free
=
free_ptr
->
prev_free
;
free_ptr
->
prev_free
->
next_free
=
free_ptr
->
next_free
;
}
/* insert the split block to free list */
new_ptr
->
next_free
=
heap
->
free_list
->
next_free
;
new_ptr
->
prev_free
=
heap
->
free_list
;
heap
->
free_list
->
next_free
->
prev_free
=
new_ptr
;
heap
->
free_list
->
next_free
=
new_ptr
;
RT_DEBUG_LOG
(
RT_DEBUG_MEMHEAP
,
(
"new free ptr: next_free 0x%08x, prev_free 0x%08x"
,
new_ptr
->
next_free
,
new_ptr
->
prev_free
));
/* increment the available byte count. */
heap
->
available_size
=
heap
->
available_size
+
MEMITEM_SIZE
(
new_ptr
);
/* lock memheap */
result
=
rt_sem_take
(
&
(
heap
->
lock
),
RT_WAITING_FOREVER
);
if
(
result
!=
RT_EOK
)
{
rt_set_errno
(
result
);
return
RT_NULL
;
}
/* split the block. */
new_ptr
=
(
struct
rt_memheap_item
*
)
(((
rt_uint8_t
*
)
header_ptr
)
+
newsize
+
RT_MEMHEAP_SIZE
);
RT_DEBUG_LOG
(
RT_DEBUG_MEMHEAP
,
(
"split: block[0x%08x] nextm[0x%08x] prevm[0x%08x] to new[0x%08x]"
,
header_ptr
,
header_ptr
->
next
,
header_ptr
->
prev
,
new_ptr
));
/* mark the new block as a memory block and freed. */
new_ptr
->
magic
=
RT_MEMHEAP_MAGIC
;
/* put the pool pointer into the new block. */
new_ptr
->
pool_ptr
=
heap
;
/* break down the block list */
new_ptr
->
prev
=
header_ptr
;
new_ptr
->
next
=
header_ptr
->
next
;
header_ptr
->
next
->
prev
=
new_ptr
;
header_ptr
->
next
=
new_ptr
;
/* determine if the block can be merged with the next neighbor. */
if
(
!
RT_MEMHEAP_IS_USED
(
new_ptr
->
next
))
{
struct
rt_memheap_item
*
free_ptr
;
/* merge block with next neighbor. */
free_ptr
=
new_ptr
->
next
;
heap
->
available_size
=
heap
->
available_size
-
MEMITEM_SIZE
(
free_ptr
);
RT_DEBUG_LOG
(
RT_DEBUG_MEMHEAP
,
(
"merge: right node 0x%08x, next_free 0x%08x, prev_free 0x%08x"
,
header_ptr
,
header_ptr
->
next_free
,
header_ptr
->
prev_free
));
free_ptr
->
next
->
prev
=
new_ptr
;
new_ptr
->
next
=
free_ptr
->
next
;
/* remove free ptr from free list */
free_ptr
->
next_free
->
prev_free
=
free_ptr
->
prev_free
;
free_ptr
->
prev_free
->
next_free
=
free_ptr
->
next_free
;
}
/* insert the split block to free list */
new_ptr
->
next_free
=
heap
->
free_list
->
next_free
;
new_ptr
->
prev_free
=
heap
->
free_list
;
heap
->
free_list
->
next_free
->
prev_free
=
new_ptr
;
heap
->
free_list
->
next_free
=
new_ptr
;
RT_DEBUG_LOG
(
RT_DEBUG_MEMHEAP
,
(
"new free ptr: next_free 0x%08x, prev_free 0x%08x"
,
new_ptr
->
next_free
,
new_ptr
->
prev_free
));
/* increment the available byte count. */
heap
->
available_size
=
heap
->
available_size
+
MEMITEM_SIZE
(
new_ptr
);
/* release lock */
rt_sem_release
(
&
(
heap
->
lock
));
/* return the old memory block */
return
ptr
;
/* return the old memory block */
return
ptr
;
}
RTM_EXPORT
(
rt_memheap_realloc
);
...
...
@@ -408,8 +410,8 @@ void rt_memheap_free(void *ptr)
/* set initial status as OK */
insert_header
=
1
;
new_ptr
=
RT_NULL
;
header_ptr
=
(
struct
rt_memheap_item
*
)
((
rt_uint8_t
*
)
ptr
-
RT_MEMHEAP_SIZE
);
header_ptr
=
(
struct
rt_memheap_item
*
)
((
rt_uint8_t
*
)
ptr
-
RT_MEMHEAP_SIZE
);
RT_DEBUG_LOG
(
RT_DEBUG_MEMHEAP
,
(
"free memory: memory[0x%08x], block[0x%08x]"
,
ptr
,
header_ptr
));
...
...
@@ -425,6 +427,7 @@ void rt_memheap_free(void *ptr)
if
(
result
!=
RT_EOK
)
{
rt_set_errno
(
result
);
return
;
}
...
...
@@ -548,31 +551,35 @@ RTM_EXPORT(rt_free);
void
*
rt_realloc
(
void
*
rmem
,
rt_size_t
newsize
)
{
void
*
new_ptr
;
void
*
new_ptr
;
struct
rt_memheap_item
*
header_ptr
;
if
(
rmem
==
RT_NULL
)
return
rt_malloc
(
newsize
);
if
(
rmem
==
RT_NULL
)
return
rt_malloc
(
newsize
);
/* get old memory item */
header_ptr
=
(
struct
rt_memheap_item
*
)((
rt_uint8_t
*
)
rmem
-
RT_MEMHEAP_SIZE
);
new_ptr
=
rt_memheap_realloc
(
header_ptr
->
pool_ptr
,
rmem
,
newsize
);
if
(
new_ptr
==
RT_NULL
&&
newsize
!=
0
)
{
/* allocate memory block from other memheap */
new_ptr
=
rt_malloc
(
newsize
);
if
(
new_ptr
!=
RT_NULL
&&
rmem
!=
RT_NULL
)
{
rt_size_t
oldsize
;
/* get the size of old memory block */
oldsize
=
MEMITEM_SIZE
(
header_ptr
);
if
(
newsize
>
oldsize
)
rt_memcpy
(
new_ptr
,
rmem
,
oldsize
);
else
rt_memcpy
(
new_ptr
,
rmem
,
newsize
);
}
}
return
new_ptr
;
header_ptr
=
(
struct
rt_memheap_item
*
)
((
rt_uint8_t
*
)
rmem
-
RT_MEMHEAP_SIZE
);
new_ptr
=
rt_memheap_realloc
(
header_ptr
->
pool_ptr
,
rmem
,
newsize
);
if
(
new_ptr
==
RT_NULL
&&
newsize
!=
0
)
{
/* allocate memory block from other memheap */
new_ptr
=
rt_malloc
(
newsize
);
if
(
new_ptr
!=
RT_NULL
&&
rmem
!=
RT_NULL
)
{
rt_size_t
oldsize
;
/* get the size of old memory block */
oldsize
=
MEMITEM_SIZE
(
header_ptr
);
if
(
newsize
>
oldsize
)
rt_memcpy
(
new_ptr
,
rmem
,
oldsize
);
else
rt_memcpy
(
new_ptr
,
rmem
,
newsize
);
}
}
return
new_ptr
;
}
RTM_EXPORT
(
rt_realloc
);
...
...
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